KILLEEN — Guns are wall-to-wall at the Guns Galore shop near Fort Hood, and so are posters: No Idiots Allowed. This Isn’t a Place for Children to Play. Firearm Trafficking Is Illegal.

But now that a second mass shooting at the Texas military post has been linked to guns bought at the squat brick store, which promises “3,000 Guns In Stock,” the message Guns Galore clerks are emphasizing is don’t blame them.

Fort Hood officials say Guns Galore, perched along the main road to the nation’s largest Army post, is where Spc. Ivan Lopez bought the .45-caliber pistol used to kill three people and wound 16 others this week. It also sold a semi-automatic pistol, laser sights and high-capacity magazines in 2009 to Nidal Hasan, who killed 13 people and wounded more than 30 others in a rampage at the post.

Lt. Gen. Mark Milley, the senior officer at Fort Hood, said Lopez bought the gun March 1, about a month before Wednesday’s attack. Hasan bought his FN 5.7 tactical pistol not long before his rampage in November 2009.

Lopez turned the gun on himself after being confronted by police Wednesday. Before the attack, he was being treated for depression and anxiety while being evaluated for post-traumatic stress disorder.

Greg Ebert, a longtime salesman at Guns Galore, said the store couldn’t comment on Lopez. But he bristled at anonymous angry calls and emails the store has been receiving, which he said included some people asking if they’re now happy that more people are dead.

“We had nothing to do with what happened out here,” said Ebert, emphasizing that he was speaking for himself and not the store.

The 34-year-old truck driver from Puerto Rico seemed to have a clean record, but investigators are now poring over Lopez’s personal history.

Federal law generally prohibits selling guns to people who’ve been involuntarily committed to a mental health facility or have been ruled by a court to be a danger to themselves or others. Gun control advocates say that leaves a gaping loophole during computer background checks.

Guns Galore is about 2 miles outside Fort Hood, and it’s the only place in the area other than pawnshops to buy firearms.

Ebert, a former police officer in Killeen, said the store counts local law enforcement agencies among its customers and said the store has a strong record of complying with federal regulations.

Ebert also said he has turned away gun buyers before.

“We’ve refused to sell to a handful of people based on their mannerisms, their overall behavior — left you with the uncomfortable feeling that I’d rather not sell a firearm to this person,” Ebert said.

Guns Galore is also where a soldier accused of planning to bomb Fort Hood troops at a restaurant in 2011 bought gunpowder and ammunition. The store later called police about Pfc. Naser Jason Abdo, saying employees had a bad feeling about him, and Abdo was arrested the next day.

“I can only control what goes on inside this facility,” Ebert said. “Once a person leaves a door, it’s beyond me.”